Micro crew height sits just above ankle bone. NanoGLIDE extremely hydrophobic, durable and anti-friction fibers eliminate bulk for unprecedented dry, friction-free comfort. Microchannels increase airflow for maximum breathability. Ventilation over foot and at arch keeps feet cool. Elasticated arch offers extra support. FABRIC: 58% NanoGlide Nylon / 39% Nylon / 3% Lycra Elastane.